PHOTONIC CRYSTAL SUPPORTING HIGH-FREQUENCY SENSITIVITY AUTOCOLLIMATION, AND DESIGN METHOD AND APPLICATION

摘要

A photonic crystal supporting a high-frequency sensitivity autocollimation, having a periodic refractive index distribution formed by at least two types of materials, and a straight isofrequency contour or a flat isofrequency plane are in a certain energy band within dispersion space of the photonic crystal, and the change rate of an isofrequency contour or isofrequency plane curvature near the frequency of the straight isofrequency contour or the flat isofrequency plane is at least 50 times improved over that in a vacuum. Because the isofrequency contour or isofrequency plane curvature of the photonic crystal near the autocollimation point dramatically changes with the frequency, so a beam diffraction intensity is very susceptible to a frequency change and a refractive index change of the material, and the photonic crystal can be used for regulating beam diffraction intensity, detecting the refraction index and so on. Also provided is a photonic crystal design method.